<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Validation\ValidationException;

/**
 * 「终版」目录的按表数据登记：确定每个页签的字段（决定导入模板与表格列）
 * 以及数据标题；数据本身独立存放，与基础目录互不影响。
 */
class PayablesFinalRegistry
{
    public const SECTION_SUPPLIER = 'supplier-payables-final';

    public const SECTION_COURIER = 'courier-payables-final';

    /** @var array<string,string> 供应商应付（终版）页签 */
    private const SUPPLIER_TITLES = [
        'product-prices' => '商品价格',
        'payment-reconciliation' => '货款对账',
        'return-reconciliation' => '退货对账',
        'invoice-deductions' => '发票扣款',
        'board-deductions' => '板材扣款',
        'compensation-details' => '赔偿明细',
        'advance-details' => '借支明细',
        'sample-deductions' => '样品扣款',
        'other-adjustments' => '其他扣款补款',
        'delivery-unpriced' => '送货未定价',
        'return-unpriced' => '退货未定价',
        'dropshipping-express' => '代发快递',
        'supplier-payables-report' => '供应商应付表',
    ];

    /** 所有终版导入模板都带“月份”列，方便按月导入和查看。 */
    private const MONTH_FIELD = ['summary_month' => ['label' => '月份', 'type' => 'month']];

    /**
     * 供应商应付（终版）在基础字段上做的增删（只影响终版目录，基础目录对应列另有口径）：
     * - prepend：紧跟在「月份」后的列；
     * - remove：去掉的列；
     * - insert：锚点列之后插入的列（锚点列名 => 列定义）；
     * - append：追加到末尾的列。
     * 货款对账在「月份」后补入库单号、采购单号、日期，末尾补未发出、对账人；
     * 退货对账去掉「快递名称」，在「标题」后插入 wms 配货单号，在「标记多标签」后补创建人。
     */
    private const SUPPLIER_FIELD_PATCHES = [
        'payment-reconciliation' => [
            'prepend' => [
                'stockNo' => ['label' => '入库单号', 'type' => 'text'],
                'purchaseNo' => ['label' => '采购单号', 'type' => 'text'],
                'date' => ['label' => '日期', 'type' => 'date'],
            ],
            'append' => [
                'unsent' => ['label' => '未发出', 'type' => 'text'],
                'reconciler' => ['label' => '对账人', 'type' => 'text'],
            ],
        ],
        'return-reconciliation' => [
            'remove' => ['express_name'],
            'insert' => [
                'title' => ['wms_pick_no' => ['label' => 'wms配货单号', 'type' => 'text']],
                'labels' => ['creator' => ['label' => '创建人', 'type' => 'text']],
            ],
        ],
    ];

    public function __construct(
        private readonly SupplierPayableMaintenanceRegistry $supplier,
        private readonly ProductPriceWorkbookImporter $productPrices,
        private readonly CourierPayableFinalRegistry $courier,
    ) {
    }

    public function supports(string $section, string $dataset): bool
    {
        return array_key_exists($dataset, $this->titles($section));
    }

    /** @return array<string,string> */
    public function titles(string $section): array
    {
        return match ($section) {
            self::SECTION_SUPPLIER => self::SUPPLIER_TITLES,
            self::SECTION_COURIER => $this->courier->titles(),
            default => [],
        };
    }

    public function title(string $section, string $dataset): string
    {
        $titles = $this->titles($section);
        if (! array_key_exists($dataset, $titles)) {
            throw ValidationException::withMessages(['dataset' => '不支持该终版目录页面。']);
        }

        return $titles[$dataset];
    }

    /** @return array<string,array{label:string,type:string}> */
    public function fields(string $section, string $dataset): array
    {
        $this->title($section, $dataset);

        if ($section === self::SECTION_COURIER) {
            return self::MONTH_FIELD + $this->courier->fields($dataset);
        }

        $fields = $dataset === 'product-prices'
            ? $this->productPrices->templateFields()
            : $this->supplier->fields($dataset);

        return self::MONTH_FIELD + $this->patchSupplierFields($dataset, $fields);
    }

    /**
     * @param  array<string,array{label:string,type:string}>  $fields
     * @return array<string,array{label:string,type:string}>
     */
    private function patchSupplierFields(string $dataset, array $fields): array
    {
        $patch = self::SUPPLIER_FIELD_PATCHES[$dataset] ?? [];

        foreach ($patch['remove'] ?? [] as $key) {
            unset($fields[$key]);
        }

        $inserts = $patch['insert'] ?? [];
        if ($inserts !== []) {
            $ordered = [];
            foreach ($fields as $key => $definition) {
                $ordered[$key] = $definition;
                foreach ($inserts[$key] ?? [] as $insertedKey => $insertedDefinition) {
                    $ordered[$insertedKey] = $insertedDefinition;
                }
            }
            $fields = $ordered;
        }

        return ($patch['prepend'] ?? []) + $fields + ($patch['append'] ?? []);
    }
}